8) Problem on Numbers

The difference between two number is 9 and product of the two number is 14.What is the square of their sum?
(A) 120 (B) 130 (C) 137 (D) 145
Answer: C


Description:
Let the given num be a & b
(a-b)=9; ab=14;
Using the formula
(a+b)^2 - (a-b)^2 = 4ab;
(a-b)^2=56+81;
(a-b)^2=137